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Error code reference

Cove Dishwasher Error Code 900153

MCM

Cove codesCove dishwasher codes

MCM: UIM master firmware not compatible.

First step from the service manual

Replace the UIM assembly.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What 900153 means on a Cove dishwasher

Error code 900153 on a Cove dishwasher indicates a firmware incompatibility between the Master Control Module (MCM) and the User Interface Module (UIM). The MCM continuously monitors communication with the UIM and verifies that the firmware version running on the UIM is compatible with the MCM's own firmware. When the MCM detects a mismatch, it triggers this error to prevent unpredictable behavior during operation. This type of fault is a handshake-level failure occurring during the initialization or runtime communication sequence between the two control boards.

The UIM is the front-facing control assembly that handles user input, display output, and cycle selection. It communicates with the MCM, which serves as the central processing unit managing wash cycles, motor control, water intake, heating, and sensor feedback. For this communication to function correctly, both modules must run mutually compatible firmware versions. If the UIM firmware is outdated, corrupted, or was replaced with an incompatible version, the MCM will flag error 900153 and halt normal operation.

This error most commonly appears after a UIM replacement where the new assembly carries a different firmware version than what the MCM expects. It can also surface after a failed firmware update attempt that left the UIM in a partially written or corrupted state. Because the fix is hardware-based rather than software-patchable from the user side, the recommended first diagnostic step is replacing the UIM assembly with a unit that carries firmware compatible with the installed MCM.

Source: manufacturer service documentation.

Common causes of 900153

  1. 01

    UIM replaced with incompatible firmware version

    Part replacement

    If the UIM was recently replaced, the new assembly may carry a firmware version the MCM does not support. This is the most common trigger for error 900153 and requires sourcing a UIM with the correct firmware version.

  2. 02

    Corrupted UIM firmware from a failed update

    Part replacement

    A firmware update that was interrupted or did not complete successfully can leave the UIM in a corrupted state where its firmware version no longer matches what the MCM expects. The UIM assembly will need to be replaced in this scenario.

  3. 03

    MCM updated independently without matching UIM update

    Wiring / connection

    If the MCM received a firmware update but the UIM was not updated in tandem, the two modules may no longer share a compatible firmware relationship. Both modules may need to be evaluated for version alignment.

  4. 04

    Faulty or damaged UIM assembly

    Part replacement

    Physical damage or an internal failure within the UIM can cause it to report an incorrect firmware version to the MCM, triggering this incompatibility error. Inspecting the UIM for visible damage or burn marks can help identify this cause.

See the test procedure for each cause

Frequently asked questions about 900153

What does 900153 mean on a Cove dishwasher?
Error code 900153 means the Master Control Module has detected that the User Interface Module is running firmware that is not compatible with it. The MCM performs a firmware version check during communication with the UIM, and when the versions do not match, it stops normal operation and displays this code. The first recommended step is replacing the UIM assembly with a compatible unit.
Can I fix error 900153 myself, or do I need a technician?
The fix for this error involves replacing the UIM assembly, which requires disconnecting the dishwasher from power and accessing the control panel components. A technician is recommended for this repair, though experienced DIYers who are comfortable working with appliance control boards may be able to complete it. It is important to ensure the replacement UIM carries firmware compatible with the installed MCM.
Will resetting my Cove dishwasher clear error code 900153?
A simple reset will not clear error 900153 because the fault is caused by a genuine firmware incompatibility between the MCM and UIM, not a temporary communication glitch. Each time the MCM attempts to communicate with the UIM and detects the mismatch, it will re-trigger the error. The underlying hardware or firmware issue must be resolved before the error will clear.
Is it safe to use my Cove dishwasher when error 900153 is displayed?
When error 900153 is active, the dishwasher is typically not able to operate normally because the MCM and UIM cannot communicate correctly. Attempting to force operation in this state is not recommended, as the control system cannot reliably manage cycle functions. The dishwasher should remain unused until the UIM compatibility issue is resolved.
How much does it cost to fix error 900153 on a Cove dishwasher?
Repair costs will depend on the price of the replacement UIM assembly and any applicable labor charges. Parts costs for a dishwasher UIM assembly can range from roughly $80 to $250 or more depending on availability and sourcing. With professional labor, total repair costs typically fall in the range of $150 to $400. Getting a quote from a certified technician familiar with Cove appliances is advisable.

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